Plate and sheet furnace.



H. W. BURNETT. PLATE AND SHEET FURNACE. APPLICATION FILED MAR. 13, 1913.

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H. W. BURNETT. PLATE AND SHEET FURNACE.

APPLICATION FILED MAR.18, 1913.

Patented July 22, 1913.

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HARRY W. BURNETT, OF CANTON, OHIO.

PLATE AND SHEET FURNACE.

To all whom it may concern.

Be it known that I, HARRY YV. BURNETT, a citizen of the United States,residing at Canton, in the county of Stark and State of Ohio, haveinvented certain new and useful Improvements in Plate and SheetFurnaces, of which the following is a specification.

My invention relates to and has to do with improvements in plate andsheet furnaces for heating plates and sheets particularly adapted andcommonly used in rolling mills where plates and sheets are to be heatedto be rolled to various gages from iron and steel.

The object of my invention is to provide an even heat to that part ofthe furnace proper in which the sheets are heated and to protect thesheets during the process of heating from the rash flame and hot airfrom the fire or combustion chamber. This object, tog-ether with otherobjects readily apparent to those skilled in the art I attain by theconstruction illustrated in the accompanying drawings, although myinvention may be embodied in a variety of other mechanical forms, theconstruction illustrated being chosen by way of example.

In the accompanying drawings--Figure l is a vertical section on line2-2, Fig. 2. Fig. 2 is a horizontal plan view. Fig. 3 is a transversevertical section on line 3-3, Fig. 1. Fig. 1- is a perspective view ofthe heating chamber showing parts of the wall broken away.

Similar numerals of reference indicate corresponding parts in all thefigures of the drawings.

In the accompanying drawings, the numeral 1 represents the foundation orbot tom of the pit, and 2 represents the foundation or bottom of thefire and heating chambers, said foundation or bottoms being preferablylocated in different horizontal planes, the side and end walls 3 and 4tand the top or crown 5 being constructed in the usual manner, referencebeing had to the construction and arrangement of the various parts goingto make up the improved furnace.

Directly above a portion of the pit foundation or bottom 1 is locatedthe ash pit 6 and a suitable distance above the bottom of this ash pitare located the grate bars 7, which are of the usual construction andsup ported in any convenient and well known Specification of LettersPatent.

Application filed. March 13, 1913.

Patented July 22, 1913.

Serial No. 754,002.

manner. Above the grate bars 7 is located the fuel or combustion chamber8, and between the combustion chamber 8 and the heating chamber 9 islocated the bridge wall 10, which bridge wall is formed solid and of aheight less than the extreme height of the combustion and heatingchambers S and 9, thereby providing a space between the top of thebridge wall 10, and the underside of the top or crown 5, therebyallowing the products of combustion and flame to pass over the top ofsaid bridge wall and into the heating chamber 9.

The heating chamber 9 is divided or made up of two parts 5) and 11 andbetween said parts 9 and 11 is located the '''all 12, which wall isprovided with a series of passages 13, which passages are formed in thewall by properly spacing the ends of the brick substantially as shown inFig. 3, but the specific arrangement of the wall is immaterial, eX- ceptthat when the wall is constructed it will be provided with the passages13, and I have illustrated a simple and easy way of forming a wall withthe desired passages. The portion of the heating chamber 11 is soconstructed and arranged that the sheets of iron or steel can be placedwithin the chamher and for the pin-pose of n'oviding means for properlyentering the sheets for properly heating the same to be rerolled, aseries of supporting bars 14. are provided, said supporting bars beingarranged substantially as shown in Fig. 4 and are made up of what mightbe termed frames and are supported by means of the side walls 3 and theinter mediate pillars 15.

In Fig. 3 I have illustrated three tiers of sheet holding bars, but itwill be understood that this number may be increased or decreasedwithout departing from the nature of my invention, owing to the factthat the number of tiers will depend on the size of the furnace, but forthe practical working of a furnace of this class three tiers of sheetholding bars is quite sufficient.

It will be understood that in front of each tier of the sheet holdingbars there should be a door 16 of sufficient size to allow the sheets tobe properly placed in the heating furnace and removed. For the purposeof preventing the accidental displacement of the sheets or morespecifically the dropping of the sheets, an inclined rack 17 isprovided, which is inclined downward from liable to become scorched andinjured and in order to avoid the excessive heating of the sheets orbetter distributing the heat the passages 13 formed in the division wall12 are provided, thereby breaking up, or in other words dividing theflame and preventing a large flame from coming in direct contact with asmall or restricted portion of the surfaces of the sheets.

For tne purpose of directing the heat and causing the same to pass intothe heating chamber directly opposite the sheet holding bars 14, theportion of the wall 12 located below said sheet holding bars is formedsolid, thereby causing all of the heat to pass through the apertures 13,said apertures being located in such a position that practically all ofthe heat will be utilized in reheating the sheets.

At one side of the furnace proper and preferably near one corner of thecombustion chamber 8 is located the chimney 18, which is formed ofsufficient height to produce the desired amount of draft. The intake ofthe chimney 18 is located in a horizontal plane near the bottoms of thetire and heating chambers. In the bottom of the heating chamber 11 arelocated the intake openings 19 and 20 of the horizontal fines, whichopenings are provided with the regulating dampers 21. From the opening19 leads the horizontal flue 22, which flue is connected to the bottomof the chimney 18. From the intake opening 20 leads the horizontal flue23, which flue connects up with the horizontal flue 22 at a pointintermediate the intake and chimney end of the horizontal flue 22, butthe exact location of the horizontal flue 23 is immaterial, except- 1tis desirable to run the same 111 a diagonal direction, thereby bringingabout a more direct draft.

It will be understood that by locating the chimneyintake openings 19 and20 near the end walls of the furnace proper and forward of the sheetreceiving racks or frames 14, that the draft of the chimneylS will besuch that the products of combustion and the heat will be drawn throughthe heating chamber 9 and the sheet heating division of said chamber 11,thereby drawing the heat in such a manner that it will be betterdistributed over the entire surfaces of the va rious sheets of iron andsteel designed to be reheated.

Having fully described my invention what I claim as new and desire tosecure by Letters Patent, is-

1. in a furnace of the class described, the combination of side and endwalls and a top wall, a heating chamber having located therein a bridgewall and a perforated wall, pillars located in the heating chamber uponthe opposite side of the perforated wall from that of the bridge wall,supporting bars carried by the pillars, said supporting bars located intiers, substantially as and for the purpose specified.

2. In a furnace of the class described, the combination of furnace.walls, a heating chamber having located therein a bridge wall and aperforated wall, pillars located in the heating chamber and uponopposite sides of the perforated wall from that of the bridge wall,sheet holding bars carried by the pillars, and inclined racks located inthe heating chamber in front of the sheet holding bars, substantially asand for the purpose specified.

In testimony that I claim the above, I have hereunto subscribed my namein the presence of two witnesses.

HARRY WV. BURNETT. lVitnesses:

F. TV. BOND, J. C. TURNER.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. C.

